taxonID	type	description	language	source
E1624D40FFE2FFE56CEDF88AFB31B1BE.taxon	diagnosis	Diagnosis. Body obovate, elongated obovate or broadly obovate, well convex dorsally. Antennae short, 11 segmented. The first segment slightly swollen, the second segment distinctly elongated and swollen, the third segment small basally and distinctly swollen towards apical part, the 4 th to 8 th segments small and short, last 3 antennomeres distinctly enlarged, forming a loose club. Most species without median impression or carina on pronotum, only one species Grouvellinus carus with an oval median discal impression, and some species with a median carina (see Bian & Jäch 2019); with a pair of sublateral carinae (in some species, sublateral carinae vestigial, not distinctly carinate). Elytra subparallel in basal 2 / 3, distal 1 / 3 slightly or distinctly attenuated in most species (In Grouvellinus spnaericus sp. n., elytra subparallel in basal half, and distinctly attenuated in distal half.). Elytral intervals 7, 8 or 5, 7, 8, or 3, 5, 7, 8 carinate. Protibia with medio-apical fringe of setae. Penis with developed apophyses, in most species, the apophyses of the penis reaching the base of the phallobase; in the other species, the apophyses of penis at least reaching the basal half of the phallobase.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE2FFE56CEDF88AFB31B1BE.taxon	distribution	Distribution. China, India, Indonesia, Korea, Malaysia, Myanmar, Nepal, Vietnam, Japan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE3FFE56CEDFDD2FEA2B7BC.taxon	description	(Figs 1 A – B, 5 A – C, 13 A – C)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE3FFE56CEDFDD2FEA2B7BC.taxon	materials_examined	Type materiral examined: holotype, male (IAECAS): “ CHINA: Yunnan / Yingjiang County / Tongbiguan Vill. ļ 97 ° 35.18 ’ E 24 ° 38.5 ’ N / 925 m, 21. VI. 2019 / Leg. Peng et al. (2) ”. Paratypes, 3 males, 1 female (IAECAS), the same data as holotype.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE3FFE56CEDFDD2FEA2B7BC.taxon	diagnosis	Diagnosis. Body broadly obovate, dark brown to black; disc of pronotum without median carina or sulcus; sublateral carinae present in basal 0.4; pronotum hemispherically vaulted; elytra short, sub-cordiform. This species can be easily distinguished from other known species in the genus Grouvellinus by its pronotum hemispherically vaulted; elytra short, sub-cordiform, and also by its penis broad in basal 0.8, and distal 0.2 suddenly narrowed, apex narrowly rounded.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE3FFE56CEDFDD2FEA2B7BC.taxon	description	Description. Habitus see Figs 1 A – B. Body broadly obovate. BL 2.5 mm, BW 1.4 mm. Dark brown to black, legs dark brown except tarsi light brown. Head. Labrum black, but yellowish brown at the anterior margin, with dense long yellowish setae anteriorlaterally; surface smooth and shining, fine setiferous punctures sparsely distributed. Clypeus and frons black, smooth and shining, medium-sized setiferous punctures densely distributed. Pronotum (Fig. 5 A) hemispherically vaulted, PL 0.8 mm, PW 1.1 mm, broadest at basal 0.3, lateral sides slightly attenuated posteriorly and distinctly attenuated anteriorly. Lateral margin denticulated in anterior half. Anterior angles sharp, slightly produced; posterior angles nearly right-angled. Surface coarse, densely punctate and pubescent, setae yellow and short. Sublateral carina present in basal 0.4, median carina absent. EL 1.7 mm, EW 1.4 mm, subparallel in anterior half, then distinctly attenuated posteriorly. Strial punctures small and deep, separated by 0.5 to 1 time of their diameters in basal half, then well separated in distal half, separated by 2 – 3 times of their diameters. Intervals coarse and convex, sparsely punctate and pubescent. Intervals 3, 5, 7, 8 carinate. Carinae on intervals 3 present from base to basal half. Carinae on intervals 5, 7, 8 extend from base to subapical part. Prosternum densely pubescent, prosternal process (Fig. 5 B) slightly narrowed in basal 0.6, subparallel in distal 0.4, apex broadly rounded. Surface smooth and shining, sparsely punctate and pubescent. Disc slightly elevated, lateral margin distinctly rimmed. Metaventrite (Fig. 5 C) broadly impressed, disc coarse with large punctures densely impressed, an oblique row of large punctures behind of metacoxa and a groove in front of metacoxa. Lateral area densely pubescent with small punctures sparsely distributed. Ventrites I – II with disc wrinkled and densely punctate. Ventrites III – IV and anterior third of ventrite V with disc smooth and shining, sparsely punctate, only with a few pubescence. A pair of ad-median carinae present on ventrite I. Ventrite V densely granulate and pubescent in distal 2 / 3; lateral area with dense pubescence (Fig. 5 C). Aedeagus (Figs 13 A – C). 1.0 mm long. Penis is about 2.7 times as long as phallobase. Penis broad, about three times as wide as the paramere, slightly broad from base to basal 0.8, then distinctly sharpened, apex narrowly rounded. Apophyses developed, reaching the subapical part of the phallobase. Parameres (in dorsal view) slim, about 1 / 3 as wide as penis, apices of the parameres narrowly rounded, not overreaching the penis. Males: BL 2.4 – 2.55 mm, BW 1.4 – 1.5 mm (n = 4); females: BL 2.5 mm, BW 1.4 mm (n = 1).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE3FFE56CEDFDD2FEA2B7BC.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE3FFE56CEDFDD2FEA2B7BC.taxon	etymology	Etymology. The epithet is derived from the Latin adjective “ spnaericus ” = “ globose ”, and refers to the shape of the pronotum.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE0FFE76CEDF908FEF4B58A.taxon	description	(Figs 1 C – D, 6 A – C, 13 D – F)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE0FFE76CEDF908FEF4B58A.taxon	materials_examined	Type material examined: holotype, male (IAECAS): “ China: Yunnan (8) / Dali City, Yongping / County, Jinguan Templeļ 25 ° 11 ′ 48 ″ N 99 ° 31 ′ 48 ″ E / 2399 m, 2018.10.19 / Leg. Peng, Dong & Zhu ”. Paratypes: 2 males (IAECAS), the same data as; 1 male (IAECAS): “ China: Yunnan (15) \ Baoshan, Mangkuan / Sandieshui | 98 ° 50 ’ 16 ” E 25 ° 26 ’ 25 ” N / 1135 m, 2018.10.22 / Leg. Peng, Zhu, Dong ”; 1 male, 2 females (IAECAS): “ China: Yunnan Prov. / 6.5 km W Tongbiguan / 24 ° 36.8 ′ N 97 ° 36.4 ′ E, / 25. VI. 2016, 1280 m / J. Hájek & J. Ruzicka ”; 1 male (IAECAS): “ China: Yunnan (17) | 25 ° 18 ′ 28 ″ N 98 ° 47 ′ 36 ″, / 1562 m, 2019.7.2 / Leg. Peng, Dong & Zhu. ”; 1 male, 2 exs. (NHMW): “ China: Yunnan 14.21.6 / 100 km W Baoshan, 1993 / Gaoligongshan Nat. Res. / E. Jendek & O. Sauss leg. ”	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE0FFE76CEDF908FEF4B58A.taxon	diagnosis	Diagnosis. Body broadly obovate, dark brown to black; pronotum broadest at basal 0.4, distinctly attenuated anteriorly; disc of pronotum without median carina or sulcus, sublateral carinae present in basal 0.3 on pronotum; elytral strial punctures small; prosternal process gradually narrowed from base to the apex. This species is large and robust, and it is similar to the known species G. hercules Jäch, 1984 and G. tibetanus Jäch, 1984 which have the similar body size, but it can be easily distinguished from G. hercules Jäch, 1984 and G. tibetanus Jäch, 1984 by its stronger habitus, male genitalia distinctly slimmer and longer, and also by its penis distinctly overreaching the parameres.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE0FFE76CEDF908FEF4B58A.taxon	description	Description. Habitus see Figs 1 C – D. Body broadly obovate. BL 3.1 mm, BW 1.5 mm. Dark brown to black, legs ferruginous, antennae and anterior margin of labrum yellowish brown. Head. Labrum smooth and shining, sparsely punctate and pubescent. Clypeus and frons black, smooth and shining, punctures and pubescence denser than on labrum. Pronotum (Fig 6 A) distinctly convex, PL 1.0 mm, PW 1.25 mm, broadest at basal 0.4, distinctly attenuated anteriorly and gradually narrowed posteriorly, surface smooth and shining, densely covered with yellowish setiferous punctures, with some sparse granules near anterior and posterior angles. Sublateral carinae present in basal 0.3, a shallow groove from apex of sublateral carina towards anterior angle on each side. Median carina absent. A pair of small impressions are in front of anterior angles of scutellum. Scutellum heart-shaped. EL 2.1 mm, EW 1.5 mm. Elytra subparallel in basal 2 / 3, then distinctly attenuated posteriorly. Strial punctures small, separated by 1 – 2 times of their diameters in basal half, then well separated and smaller in distal half (separated by 3 – 5 times of diameters). Intervals 2 – 5 distinctly convex in basal half. Intervals 7, 8 carinate. Pubescence on intervals 1, 3, 5, 7 more developed. Prosternal process (Fig. 6 B) gradually narrowed from base to apex, lateral margin distinctly rimmed, apex broadly rounded; disc smooth and shining, with a few punctures and setae in basal 2 / 5, coarse in distal 3 / 5. Metaventrite (Fig. 6 C) with disc broadly impressed, surface coarse, small punctures and pubescence sparsely distributed, an oblique row of very large punctures behind mesocoxa and a shallow groove in front of metacoxa, lateral area densely pubescent. Disc of ventrites I – IV smooth and shining, sparsely punctate and pubescent, lateral area densely pubescent. Ventrite V smooth and shining, and densely punctate on disc in basal half, the other area densely granulated and pubescent (Fig 6 C). Aedeagus (Figs 13 D – F). 1.1 mm long. Penis is about 1.4 times as long as phallobase. Penis slightly constricted at basal 0.2, then slightly narrowed towards apex, the apex narrowly rounded. Parameres distinctly shorter than the penis, slim, subparallel in basal 2 / 3, distinctly narrowed towards apex in distal 1 / 3. Males: BL 2.7 – 3.1 mm, BW 1.4 – 1.5 mm (n = 7); females: BL 2.6 – 2.7 mm, BW 1.3 – 1.4 mm (n = 2).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE0FFE76CEDF908FEF4B58A.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE0FFE76CEDF908FEF4B58A.taxon	etymology	Etymology. The epithet is derived from the Latin adjective “ elongatus ” and refers to the elongated male aedeagus.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE1FFE16CEDF9FBFA6CB45A.taxon	description	(Figs 2 A – B, 7 A – C, 14 A – C)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE1FFE16CEDF9FBFA6CB45A.taxon	materials_examined	Type materials examined: holotype, male (IAECAS): “ China: Yunnan (27) / Nujiang Pref. / Lushui City / Pianma Nat. Res. ǀ 25 ° 59 ° 39 ′ N 98 ° 39 ′ 48 ″ E / 2470 m / 2019.7.6 / Leg. Peng, Dong & Zhu ”. Paratypes: 1 male (IAECAS): “ China: Yunnan (10) / Tengchong City ǀ 25 ° 43 ° 45 ′ N 98 ° 34 ′ 20 ″ E, 1972 m, 2019.6.30 / Leg. Peng, Dong & Zhu ”; 5 males, 10 females (IAECAS): “ China: YunnAn / Tengchong City, / Jietou Vill. ǀ 25 ° 31.23 ′ N 98 ° 33.82 ′ E, / 1910 m, 30. V. 2019 / Leg. Peng et al. (14). ”	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE1FFE16CEDF9FBFA6CB45A.taxon	diagnosis	Diagnosis. Body elongated obovate, with metallic luster; median carina on pronotum absent, sublateral carinae present in basal 0.3, not developed; setiferous punctures on elytral intervals 1, 3, 5 more developed; prosternal process broad, slightly narrowed in basal half, subparallel in distal half, apex somewhat truncate. This species is similar to Grovellinus sinensis (Grouvelle, 1906) in habitus, but it can be distinctly recognized from the latter by its body with metallic luster, and penis ligulate, gradually narrowed in basal 0.8, then distinctly narrowed in distal 0.2, apex broadly rounded, not distinctly sharpened from base to the apex as in G. sinensis.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE1FFE16CEDF9FBFA6CB45A.taxon	description	Description. BL 2.4 mm, BW 1.1 mm. Habitus see Figs 2 A – B. Body elongated obovate. Body light brown, with metallic luster, antennae yellowish, ventral side brown to dark brown. Femora and tibiae dark and tarsi light brown. Head. Labrum micro-reticulate without punctures and pubescence in posterior half, sparsely punctate in anterior half, with a group of long yellowish setae anterior-laterally. Clypeus and frons smooth and shining, setiferous punctures densely distributed. Pronotum (Fig. 7 A), PL 0.7 mm, PW 0.8 mm, broadest at basal 0.4, slightly attenuated anteriorly and posteriorly. Median carina absent, sublateral carina not developed, present in basal 0.3, an oblique shallow groove present from apex of sublateral carina to anterior angle on each side. Surface densely covered with setiferous punctures. A pair of small and deep punctures in front of anterior angles of scutellum. EL 1.7 mm, EW 1.1 mm, subparallel in basal 2 / 3, then distinctly attenuated in posterior distal 1 / 3. Strial punctures moderately large, separated by 1 – 1.5 times of their diameters in basal half. Punctures becoming smaller and well separated in distal half, about 4 – 5 times of their diameters. Intervals smooth and shining, flat, with a row of setiferous punctures which more developed on intervals 1, 3, 5. Intervals 7, 8 carinate. Prosternal processs (Fig. 7 B) slightly narrowed in basal half, and parallel in distal half, lateral margin slightly rimmed; middle disc slightly elevated, smooth and shining, only with few fine punctures, apex broad, somewhat truncate. Metaventrite (Fig. 7 C) broadly and slightly impressed in posterior 0.8, disc smooth and shining, with setiferous punctures sparsely distributed; lateral area densely pubescent. A row of middle-sized punctures along anterior and posterior margin laterally. Disc of ventrites I – IV smooth and shining, setiferous punctures sparsely distributed, lateral area densely pubescent. Disc of ventrite V smooth and shining in basal half, only with few fine punctures, the other area of ventrite V densely granulate and pubescent (Fig. 7 C). Aedeagus (Figs 14 A – C). 0.7 mm long. Penis is about 2.4 times as long as phallobase. Penis is ligulate, gradually narrowed in basal 0.8, then distinctly narrowed in distal 0.2, apex broadly rounded. Penis slightly overreaching the parameres. Parameres in ventral view are broad in basal 0.25, then distinctly narrowed to basal 0.5, almost with the same breadth from basal 0.5 to basal 0.9, slightly narrowed in distal 0.1. Males: BL 2.3 – 2.4 mm, BW 1.0 – 1.1 mm (n = 6); females: BW 2.3 – 2.5 mm; 1.0 – 1.15 mm (n = 5).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE1FFE16CEDF9FBFA6CB45A.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE1FFE16CEDF9FBFA6CB45A.taxon	etymology	Etymology. The epithet is derived from the Latin adjective “ ligulaceus ” and refers to the distal shape of penis.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE7FFE26CEDFBBEFE51B382.taxon	description	(Figs 2 C – D, 8 A – C, 14 D – F)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE7FFE26CEDFBBEFE51B382.taxon	materials_examined	Type material examined: holotype, male (IAECAS): “ China: Yunnan (7) / Dehong Pref. / Yingjiang County / Madao Vill. ļ 25 ° 34 ′ 43 ″ N 97 ° 42 ′ 57 ″ E / 1438 m, 2019.6.29 / Leg. Peng, Dong & Zhu ”. Paratypes: 4 males (IAECAS): “ China: Yunnan, Dehong / Yingjiang, Tongbiguan / 24 ° 40 ′ 6 ″ N 97 ° 35 ′ 57 ″ E / 922 m, 2019.6.24 / Leg. Leg. Peng, Zhu & Dong (3) ”; 1 male (IAECAS): “ China: Yunnan / Yingjiang Pref. / Nabang Town ļ 24 ° 37.38 ′ N 97 ° 37 ′ 48 ″ E ” / 1478 m / 26. VI. 2019 / Leg. Peng et al. (6); 1 male (IAECAS): “ China: Yunnan (8) / Dehong Pref. / Yingjiang County / Tongbiguan ļ 24 ° 36 ′ 36 ″ N 97 ° 44 ′ 0 ″ E / 1522 m / 2019.6.29 / Leg. Peng, Zhu & Dong ”; 1 male, 3 females (IAECAS): “ China: Yunnan / Nujiang, Lushui / Dashanpingziļ 25 ° 41 ′ 6 ″ N 98 ° 50 ′ 16 ″ E / 1026 m / 4. VII. 2019 / Leg. Peng et al. (23) ”; 1 male (NHMW): “ China’: Yunnan 14. - 21.6. / 100 km W Baoshan, 1993 / Gaoligongshan Nat. Res. / E. Jendek & O. Sauss leg. ”.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE7FFE26CEDFBBEFE51B382.taxon	diagnosis	Diagnosis. Body small in size, brown to dark brown; median carina or median sulcus is absent on pronotum, sublateral carinae on pronotum present in basal 0.35, but not developed; elytral intervals flat; prosternal process nearly inverted trapezoid, apex truncate. This species is similar to Grovellinus cruxniger Freitag et al., 2019 in habitus and body size, but it can be distinguished from the latter by its elytra without two pair of extended yellowbrown spots, by penis distinctly extends parameres, and also by parameres slimmer. This species is also similar to Grouvellinus macilentus sp. nov. in outline, but can be distinguished from the latter by pronotum with small granules in front of anterior angles at base, without a pair of impressions in front of anterior angles which present in G. macilentus, and also by aedeagus distinctly larger, distal 0.2 of penis distinctly narrowed, and apex broadly rounded.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE7FFE26CEDFBBEFE51B382.taxon	description	Description. BL 1.85 mm, BW 0.9 mm. Habitus see Figs 2 C – D. Body elongate, brown to dark brown. Legs, mouth part and antennae yellowish brown. Head. Labrum smooth and shining, setiferous punctures on lateral margin denser than on disc, with a group of yellowish long setae anterior-laterally. Clypeus and frons smooth and shining, setiferous punctures moderately dense. Pronotum (Fig. 8 A) broadest at basal 0.4, PL 0.5 mm, PW 0.65 mm, distinctly attenuated anteriorly and posteriorly. Disc smooth and shining, short setiferous punctures densely punctate, and the area near anterior and posterior angles somewhat rugulose. Median carina absent. Sublateral carinae not developed, present in basal 0.35, bend inwards in distal 1 / 3, and a groove distinctly extends from the apex of carina towards the anterior angle on each side. Base with some small granules in front of anterior angles of scutellum. EL 1.3 mm, 0.9 mm. Elytra subparallel in basal half, distinctly attenuated in distal half, strial punctures small and deep in basal half separated by 1.5 to 3.0 times of their diameters. Punctures smaller and shallower in distal half. Intervals flat, smooth and shining. A row of setiferous punctures more developed on intervals 1, 3, 5. Intervals 7, 8 carinate. Prosternal process (Fig. 8 B) is nearly inverted trapezoid, gradually narrowed in basal half and subparallel in distal half, lateral margin distinctly rimmed, apex truncate; surface smooth and shining in basal 0.6, coarse in distal 0.4. Metaventrite (Fig. 8 C) broadly and distinctly impressed in posterior 0.8, surface smooth and shining, with few small setiferous punctures. A row of large punctures behind of mesocoxa and a row of small punctures in front of metacoxa on each side. Disc of ventrites I – IV smooth and shining, fine setiferous punctures sparsely distributed, lateral area of ventrites I – IV densely pubescent and sparsely granulate. Disc of ventrite V smooth and shining in basal 0.3, the other area rugulose, densely pubescent and granulate. Ventrite I with a pair of ad-median carinae. Aedeagus (Figs 14 D – F) 0.6 mm long. Penis is about 2.4 times as long as phallobase. Penis broad, slightly expand at basal 0.3, then slightly narrowed to basal 0.8, distal 0.2 distinctly narrowed, apex broadly rounded. Parameres distinctly shorter than penis, distinctly narrowed from base to the apex. Males: BL 1.8 – 1.9 mm, BW 0.9 – 1.0 mm (n = 8); females: BL 1.9 mm, BW 0.9 – 1.0 mm (n = 3).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE7FFE26CEDFBBEFE51B382.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE7FFE26CEDFBBEFE51B382.taxon	etymology	Etymology. The epithet is derived from the Latin adjective “ lubricous ”, refers to its smooth and shining surface of pronotum and elytra.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE4FFEC6CEDFBE6FF1CB372.taxon	description	(Figs 3 A – B, 9 A – C, 15 A – C)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE4FFEC6CEDFBE6FF1CB372.taxon	materials_examined	Type material examined: holotype, male (IAECAS): “ China: Yunnan (21) / Baoshan City / Mangkuan Town / Sandieshui ǀ 25 ° 26 ′ 25 ″ N 98 ° 50 ′ 16 ″ E / leg. Peng, Dong & Zhu ”. Paratypes: 1 male (IAECAS), the same data as holotype; 1 male (IAECAS): “ China: Yunnan (6) / Dali City, Yongping / County, Changjie ǀ 99 ° 34 ′ 22 ″ E ” 25 ° 19 ′ 23 ″ N / 1533 m, 2018.10.18 / Leg. Peng, Dong & Zhu ”; 1 male (IAECAS): “ China: Yunnan (7) / Dehong Pref. / Yingjiang County, Madao Vill. ǀ 24 ° 35 ′ 43 ″ N 97 ° 42 ′ 57 ″ E / 1438 m, 2019.6.29 / Leg. Peng, Dong & Zhu ”; 2 male, 2 females (IAECAS): “ China: Yunnan / Yingjiang Pref. / Nabang Town ǀ 24 ° 37 ′ 38 ″ N 97 ° 37 ′ 48 ″ E, 1478 m, 26. VI. 2019 / Leg. Peng et al. (6) ”; 1 male (IAECAS): “ China: Yunnan / Nujiang Pref. / Lushui City ， Pianma Town ǀ 26 ° 0.05 ′ N 98 ° 3 9.7 ′ E, 2392 m, 6. VII. 2019 / Leg. Peng et al. (26) ”; 27 exs. (NHMW): “ China: Yunnan, Chuxiong Pref. / Dashui go riv. Ban Jiu / 10 km N Yiping lang / 27.11.1999, ca. 1700 m / Schönmann & Wang (CWBS 409) ”; 10 exs. (NHMW): China: NW-Yunnan / 10 km SW Lijiang / 2500 m, 5.7.1994 / leg. Ji (13) ”; 70 exs. (NHMW): “ CHINA: W-Yunnan / env. Baoshan / 5.8.6 1993 / E. Jendek & Sauss leg. ”; 36 exs. (NHMW): “ China: NW-Yunnan / 10 km SW Lijiang / 2500 m, 5.7.1994 / leg. Schillhammer (13) ”; 8 exs. (NHMW): “ China: NW-Yunnan / ca. 100 km NW Lijiang / Hengduanshan / Jiduan-Weixi ļ ca. 5 km W Jiduan / 2100 m (11) / 3.7.1994 / leg. Schillhammer ”; 2 males, 2 females (NHMW): “ China’: Yunnan 14. - 21.6. / 100 km W Baoshan, 1993 / Gaoligongshan Nat. Res. / E. Jendek & O. Sauss leg. ”.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE4FFEC6CEDFBE6FF1CB372.taxon	diagnosis	Diagnosis. Body elongated obovate, brown to dark brown; pronotum subparallel in basal 0.4, distinctly attenuated anteriorly; disc of pronotum without median carina or sulcus, sublateral carinae on pronotum present in basal 0.3; elytral intervals 7, 8 carinate; prosternal process broad, slightly narrowed from base to the apex, and apex broadly rounded; metaventrite with a pair of ad-median carinae from base to basal 0.8. This species is similar to Grovellinus duplaris Champion, 1923 in habitus, but it can be distinguished from the latter by its larger body size, surface of pronotum smooth and shining which is coarse in G. duplaris, by interval 5 not carinate, and also by penis with sides subparallel in basal 0.75 and apices of parameres distinctly incurved, not distinctly narrowed in basal 0.75.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE4FFEC6CEDFBE6FF1CB372.taxon	description	Description. BL 2.7 mm, BW 1.35 mm. Habitus see Figs 3 A – B. Body elongate, brown to dark brown. Head. Antennae and mouth part yellowish brown, tarsi light brown. Labrum slightly indented. Clypeus and frons smooth and shining, setiferous punctures moderately dense. Pronotum (Fig. 9 A), subparallel in basal 0.4, then distinctly attenuated anteriorly, PL 0.8 mm, PW 1.0 mm. Surface smooth and shining, setiferous punctures moderately dense. Median carina absent. Sublateral carinae present in basal 0.3, and a shallow groove extending from apex of the carina towards anterior angle on each side. Base with a pair of small impressions in front of anterior angles of scutellum. EL 1.9 mm, EW 1.35 mm. Strial punctures moderately large and deep, separated by 1 – 1.5 times of their diameters in basal half. Punctures smaller and well separated in distal half. Intervals 2 – 4 slightly elevated near base. Intervals smooth and shining, intervals 1, 3, 5 with a row of setiferous punctures. Intervals 7, 8 carinate. Prosternal process (Fig. 9 B) slightly narrowed from base to apex, lateral margin distinctly rimmed, disc smooth and shining, only with few setiferous punctures; distal 1 / 3 of prosternal process somewhat rugulose. Metaventrite (Fig. 9 C) broadly and shallowly impressed, and disc smooth and shining, fine punctures sparsely distributed; with a pair of ad-median carinae from base to basal 0.8, lateral area densely pubescent. Middle disc of ventrites I – IV and anterior 1 / 4 of ventrite V smooth and shining, fine punctures sparsely distributed; lateral area of ventrites I – IV densely pubescent. Distal 2 / 3 of ventrite V densely granulate and pubescent (Fig 9 C). Aedeagus (Figs 15 A – C). 0.75 mm long. Penis is about 1.6 times as long as phallobase. Penis sub-parallel in basal 0.75, distinctly narrowed in distal 0.25, apex roundly extended. Penis slightly overreaching the parameres. In ventral view, parameres broad at base, then almost with the same breadth from basal 0.1 to 0.8, distinctly narrowed from basal 0.8 to 0.9, then incurved in distal 0.1, apex narrowly rounded with some long setae. In dorsal view, subparallel in basal 0.6, then distinctly narrowed to basal 0.95, apices incurved. Males: BL 2.5 – 2.7 mm, BW 1.2 – 1.35 mm (n = 7); females: BL 2.6 – 2.7 mm, BW 1.3 – 1.35 mm (n = 2).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE4FFEC6CEDFBE6FF1CB372.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE4FFEC6CEDFBE6FF1CB372.taxon	etymology	Etymology. This species is named after Yunfei Peng (Shanxi, China), who is a very good collector of water beetles.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEAFFED6CEDFC63FDC8B1BE.taxon	description	(Figs 3 C – D, 10 A – C, 15 D – F)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEAFFED6CEDFC63FDC8B1BE.taxon	materials_examined	Type material examined: holotype, male (IAECAS): “ China: Yunnan / Nujiang Pref. / Lushui City, Panma Townļ 26 ° 0.05 ′ N 98 ° 39.7 ′ E, 2392 m, 6. VII. 2019 / Leg. Peng et al. (26). Paratypes: 13 males, 1 female (IAECAS), the same data as holotype; 1 male (IAECAS): “ China: Yunnan / Yingjiang County / Tongbiguan Vill. ļ 26 ° 36.58 ′ N 97 ° 36.33 ′ E / 1001 m, 24. VI. 2019 / Leg. Peng et al. (1) ”.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEAFFED6CEDFC63FDC8B1BE.taxon	diagnosis	Diagnosis. Body black, elongated obovate, middle-sized; pronotum broadest at basal 0.4, then distinctly attenuated anteriorly and slightly attenuated posteriorly; strial punctures large and deep on elytra; elytral intervals 7, 8 distinctly carinate; prosternal process is linguiform. This species is similar to Grouvellinus tibetanus Jäch, 1984 in habitus, but it can be distinguished from the latter by its aedeagus distinctly smaller than G. tibetanus, and also by subapical part of penis suddenly narrowed, not gradually narrowed as in G. tibetanus.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEAFFED6CEDFC63FDC8B1BE.taxon	description	Description. BL 2.5 mm, BW 1.2 mm. Body elongated obovate. Habitus see Figs 3 C – D. Body black, legs dark brown except femora black. Antennae yellowish brown. Head. Labrum smooth and shining, setiferous punctures moderately dense on disc, yellowish pubescence very dense laterally. Clypeus and frons smooth and shining, punctures and pubescence moderately dense. Pronotum (Fig. 10 A) broadest at basal 0.4, distinctly attenuated anteriorly and slightly attenuated posteriorly, PL 0.7 mm, PW 0.9 mm. Disc densely punctate and pubescent. Pubescence short, sub-erected. Sublateral carinae present in basal 0.3, a deep oblique groove extending from apex of carina towards anterior angle on each side. Median carina presents in basal 0.1. The area near anterior and posterior angles somewhat rugulose. A pair of small impressions are in front of anterior angles of scutellum. EL 1.8 mm, EW 1.2 mm. Elytra conjointly rounded. Strial punctures large and deep, separated by 0.5 – 1 time of the diameter in basal half. Punctures smaller and shallower, well separated in distal half (4 – 5 times of their diameters). Intervals flat, but intervals 2 – 4 elevated in basal 0.2, intervals 7, 8 carinate. Intervals 1, 3, 5 with a row of small setiferous punctures separately. Prosternal process (Fig. 10 B) is linguiform, gradually narrowed in basal half, subparallel in distal half, apex broadly rounded; disc smooth and shining, slightly elevated in basal 0.6, with few small setiferous punctures; distal 0.4 somewhat rugulose; lateral margin distinctly rimmed. Metaventrite (Fig. 10 C) narrowly impressed, disc coarse, almost without pubescence; lateral area densely pubescent; with a row of very large punctures behind of mesocoxa and a groove in front of metacoxa on each side. Ventrite I rugulose in basal half, smooth and shining in distal half, disc only with few punctures; a pair of admedian carinae present; lateral area densely pubescent. Ventrites II – IV with disc smooth and shining, setiferous punctures sparsely distributed, lateral area densely pubescent. Ventrite V densely granulate and pubescent except basal 0.3 on disc (Fig. 10 C). Aedeagus (Figs 15 D – F) 0.65 mm long. Penis is about 2.1 times as long as phallobase. Penis broad in basal 0.8, distal 0.2 suddenly sharpened, apex narrowly rounded. Parameres are slightly shorter than penis, broad in basal 0.2, then gradually narrowed to basal 0.8, distal 0.2 slightly narrowed, apices narrowly rounded. Males: BL 2.3 – 2.6 mm, BW 1.1 – 1.2 mm (n = 8); females: BL 2.6 mm, BW 1.2 mm (n = 1).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEAFFED6CEDFC63FDC8B1BE.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEAFFED6CEDFC63FDC8B1BE.taxon	etymology	Etymology. The epithet is derived from the Latin adjective “ spiculatus ” which means cuspidal, refers to that the distal 0.2 of penis being cuspidal.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEBFFEE6CEDFDD2FB29B12E.taxon	description	(Figs 4 A – B, 11 A – C, 16 A – C)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEBFFEE6CEDFDD2FB29B12E.taxon	materials_examined	Type material examined: holotype, male (IAECAS): “ China: Yunnan (30) / Nujiang Pref. / Fugong County / Shiyueliang Townļ 27 ° 14 ′ 2 ″ N 98 ° 53 ′ 25 ″ E / 1074 m, 2019.7.8 / Leg. Peng & Dong. Paratypes: 2 males, 1 female (IAECAS), the same data as holotype; 1 male (IAECAS): “ China: Yunnan / Yingjiang Pref. / Nabang Town ļ 24 ° 37.38 ′ N 97 ° 37.48 ″ E ” / 1478 m / 26. VI. 2019 / Leg. Peng et al. (6); 1 ex. (IAECAS): “ China: Yunnan / Tengchong City / Jietou Vill. ļ 25 ° 31 ′ 14 ″ N 98 ° 33 ′ 49 ″ E / 1910 m, 30. VI. 2019 / Leg. Peng & Dong (14) ”; 1 male (IAECAS): “ China: Yunnan / Tengchong, Mingguang / Zhongtang Vill. ļ 25 ° 26 ′ 2 ″ N 98 ° 31 ′ 16 ″ E / 1823 m, 30. VI. 2019 / Leg. Peng & Dong (16) ”; 1 ex (NHMW).: “ China: Yunnan, Xishuangbanna / ca. 15 km W Menglun / 5.11.1999, ca. 700 - 800 m / leg. Jäch et al. (CWBS 354) ”; 4 exs. (NHMW): “ CHINA: Yunnan, Xishuangbanna / ca. 10 km NW Menglun / 7.11.1999, ca 700 m / leg. Jäch et al. (CWBS 359) ”; 20 exs. (NHMW): “ CHINA: Yunnan, Xishaungbanna / pass betw Jinghong, Mengyang / 12.11.1999, ca. 1100 m / leg. Jäch et al. (CWBS 379) ”; 1 ex. (NHMW): “ CHINA: Yunnan, Xishuangbanna / ca. 10 km NW Menglun / 7.11.1999, ca. 700 - 800 m / leg. Jäch et al. (CWBS 380) ”; 2 exs. (NHMW): “ China: Yunnan, Simiao Pref. / 40 km S Simiao, 16.11.1999 / Caiyang River, NR, ca. 135 m / Schönmann & Wang (CWBS 389); 1 ex. (NHMW): “ CHINA: Yunnan, Chuxiong Pref. / Da Shui go riv. Ban Jiu / 10 km N Yiping lang / 27.11.1999, ca. 1700 m / Schönmann & Wang (CWBS 409).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEBFFEE6CEDFDD2FB29B12E.taxon	diagnosis	Diagnosis. Body broadly obovate, 2.2 – 2.3 mm long, dorsum black; disc of pronotum without carina or sulcus, sublateral carina present in basal 0.3 on pronotum; elytra distinctly attenuated in distal half; strial punctures small in basal half, smaller in distal half; elytral intervals 7, 8 carinate; prosternal process is subquadrate. This species can be distinguished from Grouvellinus spnaericus sp. nov. and G. elongatus sp. nov. which also with broad body by its smaller body size, by its distal half of elytra distinctly attenuated, by its paramere with an indention in basal half, and also by distal third of parameres distinctly narrowed.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEBFFEE6CEDFDD2FB29B12E.taxon	description	Description. BL 2.3 mm, BW 1.2 mm. Body broadly obovate, habitus see Figs 4 A – B. Dorsum black, antennae yellowish brown. Legs light brown. Ventral side brown to dark brown. Head. Labrum smooth and shining, sparsely punctate and pubescent, anterior margin densely pubescent laterally. Clypeus and frons smooth and shining, pubescence denser than on labrum. Pronotum (Fig. 11 A). PL 0.7 mm, PW 0.9 mm, broadest at basal 0.4, distinctly attenuated anteriorly and slightly attenuated posteriorly. Disc distinctly convex, densely punctate and pubescent. The pubescence short and semierected. Median carina absent. Sublateral carinae present in basal 0.3, a shallow groove extending from apex of the carina towards anterior angle on each side. EL 1.6 mm, EW 1.2 mm. Elytra subparallel in basal 1 / 2, distinctly attenuated in distal half. Strial punctures small, separated by 2 – 3 times of their diameters in basal half, then smaller and well separated in distal half. Intervals convex, sparsely punctate, with a row of pubescence on intervals 1, 3, 5. Intervals 7, 8 carinate. Prosternal process (Fig. 11 B) is subquadrate, with lateral sides almost subparallel, lateral margin distinctly rimmed, disc sparsely punctate and pubescent, apex broadly cambered. Metaventrite (Fig. 11 C) slightly and broadly impressed, disc sparsely pubescent and punctate; lateral area densely pubescent. A row of large punctures behind of mesocoxa, and a row of small punctures in front of metacoxa. Disc of ventrites I – IV smooth and shining, sparsely punctate and pubescent, and the lateral area densely pubescent. Disc of ventrite V smooth and shining in basal half, and the other area densely pubescent and granulate (Fig. 11 C). Aedeagus (Figs 16 A – C). 0.6 mm long. Penis slightly longer than phallobase. Penis is broad in basal half, gradually narrowed in distal half. Paramere with a big indention in basal half, distal half broad, apex broadly rounded. Males: BL 2.2 – 2.3 mm, BW 1.1 – 1.2 mm (n = 4); females: BL 2.0 – 2.4 mm, BW 1.1 mm (n = 2).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEBFFEE6CEDFDD2FB29B12E.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFEBFFEE6CEDFDD2FB29B12E.taxon	etymology	Etymology. This species is named after Nujiang autonomous prefecture in Yunnan Province.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE9FFE86CEDFF7EFAD6B09F.taxon	description	(Figs 4 C – D, 12 A – C, 16 D – F)	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE9FFE86CEDFF7EFAD6B09F.taxon	materials_examined	Material examined: Holotype, male (IAECAS): “ China: Yunnan (22) / Baoshan City / Mangkuan Town / Xinguang Villageļ 25 ° 28 ′ 18 ″ N 98 ° 50 ′ 53 ″ E / 1026 m, 2019.7.4 / Leg. Peng, Dong & Zhu ”. Paratypes: 1 male (IAECAS): “ China: Yunnan (7) / Dali City, Yongping / County, Sanjia Vill. ļ 25 ° 17 ′ 59 ″ N 98 ° 36 ′ 34 ″ E / 1517 m, 2018.10.18 / Leg. Peng, Dong, & Zhu ”; 1 male (IAECAS): “ China: Yunnan (20) / Nujiang, Lushui, / Pianma ļ 26 ° 0 ′ 3 ″ N 98 ° 39 ′ 42 ″ E / 2392 m, 2018.10.25 / Leg. Peng, Zhu, Dong ”; 1 male (IAECAS) “ China: Yunnan (6) / Dehong Pref. / Yingjiang County / Pingyuan Townļ 24 ° 50 ′ 42 ″ N 98 ° 56 ′ 27 ″ E / 1074 m, 2019.6.27 / Leg. Peng, Dong, & Zhu; 1 male. (IAECAS): “ China: Yunnan / Baoshan City / Lujiang Town, Shiti Vill. ļ 24 ° 56.87 ′ N 98 ° 49.78 ′ E / 1050 m, 3. VII. 2019 / Leg. Peng et al (19); 4 males, 1 female (IAECAS): “ China: Yunnan / Baoshan City / Mangkuan Town / Sandieshui falls ļ 25 ° 26.42 ′ N 98 ° 50.2 ′ E / 1135 m / 3. VII. 2019 / Leg. Peng et al. (21) ”; 1 male (IAECAS): “ China: Yunnan (30) / Nujiang Pref. / Fugong County / Shiyueliang Townļ 27 ° 14 ′ 2 ″ N 98 ° 53 ′ 25 ″ E / 1074 m, 2019.7.8 / Leg. Peng & Dong; 3 males (IAECAS): “ China: Yunnan / Nujiang, Fugong / Shiyueliang ļ 27 ° 14 ′ 2 ″ N 98 ° 53 ′ 25 ″ E / 1474 m / 9. VII. 2019 / Leg. Peng et al. (31) ”; 1 male (NHMW): “ CHINA: Yunnan, Chuxiong Pref. / 15 km W Lufang / 27.11.1999, ca. 1500 m / Schönmann & Wang (CWBS 408) ”; 1 male, 1 female (NHMW): “ CHINA: Yunnan, Chuxiong Pref. / Da Shui Go riv. nr. Banjiu / 10 km N Yipinglang / 27.11.1999, ca. 1700 m / Schönmann & Wang (CWBS 409) ”.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE9FFE86CEDFF7EFAD6B09F.taxon	diagnosis	Diagnosis. Body obovate, dorsum brown except head black and antennae yellowish brown; pronotum without median carinae or sulcus; sublateral carinae present in basal 0.3, not developed; elytra subparallel in basal 2 / 3, distinctly narrowed in distal 1 / 3; elytral intervals flat, smooth and shining; strial punctures small; prosternal process broad, nearly subquadrate, apex truncate. This species is similar to Grovellinus luciaensis Freitag et al., 2019 in habitus and similar body size, but it can be distinguished from the latter by its apex of prosternal process almost truncate, by strial punctures on elytra small and shallowly impressed and intervals on elytra flat, not elevated, and also by distal 1 / 5 of penis not suddenly sharpened. This species can be distinguished from Grouvellinus lubricus sp. nov. by pronotum with a pair of impressions in front of anterior angles of scutellum, and also by aedeagus smaller, distal 1 / 3 of penis distinctly narrowed, apex narrowly rounded.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE9FFE86CEDFF7EFAD6B09F.taxon	description	Description. Small in size. BL 1.7 mm, BW 0.9 mm. Habitus see Figs 4 C – D. Head black except mouth part and antennae yellowish brown. Dorsum brown, ventral surface brown to dark brown. Legs yellowish brown. Head. Labrum smooth and shining, sparsely punctate and pubescent, with a group of short yellowish setae anterio-laterally. Clypeus smooth and shining, punctures denser and larger than on labrum. The punctures and pubescence on frons similar to that on the clypeus. Pronotum (Fig. 12 A) broadest at basal 0.4, slightly attenuated anteriorly and posteriorly, PL 0.55 mm, PW 0.7 mm. Disc smooth and shining, densely punctate and pubescent. The area near anterior and posterior angles rugulose, with a few granules. Median carina or sulcus absent. Sublateral carinae present in basal 0.3, not parallel. A groove extends from apex of carina to anterior angle on each side. A pair of small oval impressions present in front of anterior angles of scutellum. EL 1.2 mm, EW 0.9 mm. Elytra subparallel in basal 2 / 3, then distinctly narrowed towards apex. Strial punctures small, separated by 2 – 3 times of their diameters in basal half. Punctures becoming smaller and shallower in distal half. Intervals smooth and shining, setiferous punctures more developed on intervals 1, 3, 5. Intervals 7, 8 carinate. Prosternal process (Fig. 12 B) broad, nearly subquadrate; lateral sides almost subparallel, apex truncate. Lateral margin distinctly rimmed; basal 3 / 5 smooth and shining, flat, only with few fine punctures; distal 2 / 5 rugulose. Metaventrite (Fig. 12 C) with disc broadly and slightly impressed, surface rugulose, punctures sparsely distributed. Lateral area densely pubescent. Each side with a row of large punctures behind of mesocoxa, and a row of small punctures in front of metacoxa. Ventral side. Disc of ventrites I – IV smooth and shining, sparsely punctate, lateral area of ventrites I – IV densely pubescent. Ventrite I with a pair of ad-median carinae. Disc of ventrite V smooth and shining, sparsely granulate in basal 0.7, distal 0.3 densely pubescent and granulate, lateral area densely pubescent (Fig. 12 C). Aedeagus (Figs 16 D – F) 0.45 mm long. Penis is about 2 times as long as phallobase. Penis overreaching the parameres, almost subparallel in basal 2 / 3, then distinctly narrowed in distal 1 / 3, apex narrowly rounded. Parameres broad at base, distinctly narrowed in basal 0.1, then gradually narrowed to the apex, and apices rounded. Males: BL 1.6 – 1.8 mm, BW 0.8 – 0.9 mm (n = 11); females: BL 1.6 – 1.7 mm, BW 0.8 mm (n = 2).	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE9FFE86CEDFF7EFAD6B09F.taxon	distribution	Distribution. China: Yunnan.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
E1624D40FFE9FFE86CEDFF7EFAD6B09F.taxon	etymology	Etymology. The epithet is derived from the Latin adjective “ macilentus ” and refers to its slim body.	en	Bian, Dongju, Zhang, Yi (2023): Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae). Zootaxa 5254 (2): 257-277, DOI: 10.11646/zootaxa.5254.2.6, URL: http://dx.doi.org/10.11646/zootaxa.5254.2.6
